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I just bought a bunch of the Yamaha product "combustion engine cleaner" and tried it on the pistons (with the heads off) of a motor that I was tearing down. I tried both side by side and Yamaha Combustion Engine cleaner doesn't hold a candle to powertune. Powertune works much much faster.
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Just to clear things up here. . . . I was tearing the motor down to part it out. The block had a nice big hole in it. While the heads were off I thought I'd see if there was a difference b/w powertune and Yamaha's Combustion engine cleaner.